4

Sounds like reaction:
It does sound like your skin acted to something you put on it. It can take several days to go away. Since it does not bother you, just waiting is probably the best idea. But do not try any new products while your skin is irritated. If you want to, an over the counter Hydrocortisone cream is safe to use for a few days.
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5

Need for evaluation:
It is not feasible to provide a meaningful opinion without examining you and your symptoms warrant evaluation by a physician. It would require a more detailed history, physical examination and may be some lab tests.
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6

Nodule:
You did not mention your age, but assuming that you are young and have acne, i would say that you have an inflamed nodular acne that will require oral antibiotics and local moist warm compresses.
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8

Hematoma:
I would recommend that you should consult a physician and get x-rays done to rule out mandible or jaw bone fracture.. My guess is that you probably have developed a hematoma which is a collection of blood under the skin. Large hematomas sometimes need to be evacuated surgically. While smaller ones can resolve spontaneously.
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9

Sun screen:
Please use sun screen on your face. Apply as instructed in the package. If the usual sun screen stings your eyes, you may get one with zinc oxide. You may consult this site for more information on this topic.
http://www.webmd.com/beauty/features/whats-best-sunscreen#1
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Drink enough water daily so that your urine is mostly colorless.
Practice safe sex.
Get HPV vaccine.
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10

Moisturizer:
Excess water exposure removes the fatty parts of the skin. So each time you wash your face or hands, put a simple moisturizer; avoid fragrances and add-ons, many people get reactions to them.
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